Bypass flow path open/close type active engine mount device using air chamber

Abstract

An active engine mount has a liquid chamber for keeping liquid in a housing. The active engine mount includes a separation plate that is disposed in the liquid chamber, has a space at its center, and divides the liquid chamber into an upper liquid chamber and a lower liquid chamber. At least one primary flow path connects the upper liquid chamber and the lower liquid chamber. An orifice plate is disposed under the space at the center of the separation plate and has at least one bypass flow path connected with the lower liquid chamber. An air chamber is disposed between the orifice plate and the space at the center of the separation plate, and is configured to open or close the at least one bypass flow path by changing its size.

What is claimed is: 
     
       1. An active engine mount that has a liquid chamber for keeping liquid in a housing, the active engine mount comprising:
 a separation plate that is disposed in the liquid chamber, has a space at its center, and divides the liquid chamber into an upper liquid chamber and a lower liquid chamber; 
 at least one primary flow path that connects the upper liquid chamber and the lower liquid chamber; 
 an orifice plate that is disposed under the space at the center of the separation plate and has at least one bypass flow path connected with the lower liquid chamber; and 
 an air chamber that is disposed between the orifice plate and the space at the center of the separation plate and is configured to open or close the at least one bypass flow path by changing its size; and 
 a piston connected to a bottom of the air chamber and configured to move towards and away from the air chamber in an up and down direction; 
 wherein the air chamber is contracted or expanded by pneumatic pressure adjusted by towards the upper and lower sides movement of the piston. 
 
     
     
       2. The active engine mount of  claim 1 , wherein the piston is configured to move towards and away from the air chamber in an up and down direction using a solenoid valve. 
     
     
       3. The active engine mount of  claim 1 , wherein the piston is connected to a piston return spring. 
     
     
       4. The active engine mount of  claim 3 , wherein the piston return spring comprises rubber. 
     
     
       5. The active engine mount of  claim 1 , wherein the at least one primary flow path is two or more primary flow paths, and the at least one bypass flow path is two or more bypass flow paths.